Go for it, absolutely.
Many of the very greatest experiences that are told and re-told come from groups who were completely "green", simply because they didn't know know "how it was done"done properly", and thus experienced things in their own, genuine, unique way.
(Some of the greatest moments in my RPG / LARP career only happened because we were unexperienced.)
Moreover, being on a "common ground" experience-wise is a boon as well. Newbies in an experienced group can work, but can also experience disconnection, or just "following around" because they're overawed by the more experienced players.
This is a game about discovering. Discover what style you want to play, not what style others could teach you. (You can do that later on.)
Have fun.
Anecdotes:
We played Talislanta once, in a huge group of 12 or more players, with no-one in the room -- GM included -- having any previous experience with the game world, or the game mechanics. The "thing" about Talislanta is that there is nothing "classic" in it. No human cleric, dwarven warrior, or elven ranger. Everyone is completely alien. After a truly enjoyable evening of serious character play, the GM looked at us in a funny way, asking us if we actually realized she hadn't said a word for the last couple of hours... We hadn't. One of the best RPG sessions ever.
My very first LARP (and that's >20 years since) was the first for everybody else in the group as well, except the GM who had played once (!) before. After the first day, well over a dozen players crammed into a single room, keeping a three-man watch at the only door the whole night, because we never even considered that the NPCs would need (or want) sleep as well. I have never since experienced another LARP with that feeling of intense, real, immediate threat, which came from literally no-one knowing what to expect. (Actually we were ambushed in the middle of the night, simply because the GM thought she couldn't all that guarding go to waste.)